Numerical Simulation for Microstructure Evolution in In718 Alloy During Cylindrical Cup Backward Extrusion

Hu, Xi; Mei, Rui; Zhu, Fu Xian; Fan, Y.; Liang, Yuqing; Wang, X. B.; Wang, D. G.; Jing, Zhang

doi:10.4028/www.scientific.net/amr.650.92

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…В роботі [5] авторами виконано чисельне моделювання отримання порожнистого виробу з матеріалу In718 за допомогою способу гарячого зворотного видавлювання. В різних частинах отриманої деталі досліджено структуру зерна.…”

Section: аналіз літературних даних та постановка проблемиunclassified

The effect of deformation rate on the process of hot extrusion with dispensing of round hollow semi-finished products

Dragobetskyi,

Kaliuzhnyi,

Kaliuzhnyi

et al. 2024

Mech. Adv. Technol.

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Background. Stamping of round hollow semi-finished products by hot reverse extrusion is one of the initial operations in the manufacture of hollow products for special purposes. The force and shape change of the metal during hot plastic forming is significantly affected by the deformation rate or the speed of movement of the deforming tool. For special-purpose products, certain mechanical properties are required in the wall height and bottom part. The wall height properties are ensured at subsequent stretching transitions with thinning of the semi-finished product obtained by hot extrusion, which involves working out the metal structure by plastic deformation to achieve the required properties. Therefore, it is an urgent task to study the effect of the deformation rate on the force and shape change of the metal during hot reverse extrusion of hollow semi-finished products.Goal. To determine the influence of the deformation rate on the parameters of hot reverse extrusion with the dispensing of hollow semi-finished products from round and square billets by means of finite element method (FEM) modeling and to compare the results of theoretical researches.Methodology of implementation. Theoretical researches of extrusion power modes, specific forces, and the stress-strain state of metal were carried out by modeling using the FEM in the DEFORM software environment.Results. The FEM was used to model the process of hot reverse extrusion with dispensing of round hollow semi-finished products from mild steel with protrusions at the end of the bottom part on the side of the cavity and on the outer surface. The deformation rate was in the range of 20 to 80 mm/sec. Round and square cross-sectional blanks were used. The dependence of the extrusion force on the punch displacement was determined. The distribution of specific forces on the deforming tool was determined. The stress-strain state and temperature distribution in the deformed metal at the end of extrusion were determined. The development of the metal structure by hot plastic deformation was evaluated and the results obtained were comparedConclusions. The effect of the deformation rate on the parameters of hot reverse extrusion with dispensing of round hollow semi-finished products was determined

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Section: аналіз літературних даних та постановка проблемиunclassified

The effect of deformation rate on the process of hot extrusion with dispensing of round hollow semi-finished products

Dragobetskyi,

Kaliuzhnyi,

Kaliuzhnyi

et al. 2024

Mech. Adv. Technol.

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“…В роботі [5] авторами виконано чисельне моделювання отримання деталі типу стакан з матеріалу In718 за допомогою способу гарячого зворотного видавлювання. В різних частинах отриманої деталі досліджено структуру зерна.…”

Section: аналіз літературних даних та постановка проблемиunclassified

Comparative analysis of hot reverse extrusion of hollow products from round and square blanks

Kaliuzhnyi,

Sytnyk,

Levchenko

2023

Mech. Adv. Technol.

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Background. Modern production of hollow products by hot reverse extrusion poses the task of reducing energy consumption and reducing metal costs for the manufacture of such products. Such problems can be solved by using them for extruding square-shaped blanks. Goal. Determination using the finite element method (FEM) of the parameters of hot reverse extrusion of hollow products from round and square blanks and comparison of the results of theoretical studies. Methodology of implementation. Theoretical studies of force modes of extrusion, specific forces and stress-strain state of metal were carried out by simulation using MSE in the DEFORM software environment. The results. Modeling of the process of hot reverse extrusion from low-carbon steel of a hollow product with protrusions on the end of the bottom part was carried out with the help of MSE. Round and square blanks are used. Extrusion forces, forces for removing punches from deformed blanks and forces for pushing out products from matrices are established. The distribution of specific forces on the deforming tool is revealed. The stress-strain state and temperature distribution in the deformed metal at the end of extrusion were determined. Evaluation of the working of the metal structure by hot plastic deformation was carried out and the obtained parameters were compared. Conclusions. The use of square-shaped blanks during hot reverse extrusion of hollow products is substantiated.

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“…With the development of computer-hardware and numerical processing technology, numerical simulation has been proven to be the most accurate method to study the heat transfer, deformation behavior, or dynamic recrystallization (DRX) process during backward extrusion processing. Mei et al [5,6] used DEFORM 3D to develop program and discuss the dynamic recrystallization, grain size, stress/strain distribution, and forming load of different alloy during hot backward extrusion. Ketabchi et al [7] carried out an experimental and finite element analysis of a backward extrusion process of 7075 Al alloy and studied subsequently the forming load and distribution of strain and stress.…”

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confidence: 99%

Study on Hot Deformation Behavior of 7085 Aluminum Alloy during Backward Extrusion Process

Mei

Bao

et al. 2015

Modelling and Simulation in Engineering

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Compression test was carried out and the true stress-strain curves were obtained from the hot compression of 7085 alloy. A numerical simulation on the deformation behavior of 7085 aluminum alloy during the backward extrusion was also performed by finite element method. The results show that dynamic recrystallization occurs in the hot compression of 7085 alloy and the peak stress reaches higher values as the strain rate increases and deformation temperature decreases. The backward extrusion processes include contact deformation, initial deformation, and steady deformation. Severe plastic deformation of shear and compression occurs when the metal flowed into the channel between fillet of punch and wall of die so that the grain size can be refined by backward extrusion. The deformation in the region of top of wall is too small to meet the mechanical properties of requirements and the metal usually needs to be trimmed. The experiments with the same parameters as simulation had been carried out and the experimental cup after extrusion has better quality.

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Numerical Simulation for Microstructure Evolution in In718 Alloy During Cylindrical Cup Backward Extrusion

Cited by 5 publications

References 13 publications

The effect of deformation rate on the process of hot extrusion with dispensing of round hollow semi-finished products

The effect of deformation rate on the process of hot extrusion with dispensing of round hollow semi-finished products

Comparative analysis of hot reverse extrusion of hollow products from round and square blanks

Study on Hot Deformation Behavior of 7085 Aluminum Alloy during Backward Extrusion Process

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